package com.task.controller;


import com.task.common.R;
import jakarta.servlet.ServletOutputStream;
import jakarta.servlet.http.HttpServletResponse;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.UUID;

@Slf4j
@RestController
@RequestMapping("/common")
public class CommonController {

//    @Value("${task.path}")一直没效果是因为path：D:\ 冒号号后面没有打空格
    @Value("${task.path}")
    private String basePath;
    @PostMapping("/upload")
    public R<String> upload(MultipartFile file){
//        file是一个临时文件，需要转存到指定位置
        log.info(file.toString());
        //获取文件原始名称(不建议获取，因为文件名可能重复，而且可能被修改)
        String originalFilename = file.getOriginalFilename();
        String suffix = null;
        if (originalFilename != null) {
            suffix = originalFilename.substring(originalFilename.lastIndexOf("."));
        }
//        使用UUID生成随机文件名，防止文件名重复
        String filename = UUID.randomUUID() + suffix;
        
//        /创建一个目录对象
         File dir = new File(basePath);
//         判断当前目录是否存在
        if(!dir.exists()){
            dir.mkdirs();
        }
        
        try {
            file.transferTo(new File(basePath + filename));
        } catch (IOException e) {
            throw new RuntimeException(e);
        }

        return R.success(filename);
    }

    @GetMapping("/download")
   public void delete(String name, HttpServletResponse response){
//        输入流，通过输入流读取文件内容
       try {
           FileInputStream fileInputStream = new FileInputStream(new File(basePath + name));

//           输出流，通过输出流将文件内容写回
           ServletOutputStream outputStream = response.getOutputStream();

            int len = 0;
            byte[] bytes = new byte[1024];
            while ((len = fileInputStream.read(bytes)) != -1){
                outputStream.write(bytes,0,len);
                outputStream.flush();
            }
            outputStream.close();
            fileInputStream.close();
       } catch (Exception e) {
           e.printStackTrace();
       }
    }
}
